Discerning NPT from NPTF

[vavavroom]

Is there a way to visually tell NTP from NPTF threads? How to measure to find out which kind it is? Talking about male threads.

 

[SHOZ]

The NTPF threads are machined or cut compared to the NPT that are rolled. This video is pretty informative.

 

[Hall]

Visually - NPTF will have larger (major) diameter threads. This is only useful if you have one of each to compare though.

 

[Hermann]

Very strange thread

 

[BlueOvalFitter]

Very strange thread

This thread is not all it's cut up to be.
You can see the thread taper more clearly on NPT pipe/fittings.

 

[vavavroom]

First of all, thanks to the moderator who fixed my mistake.

Thanks for the responses. I'll see if I can take a picture later today because I'm still not sure which type thread it is.

 

[vavavroom]

I see toolmarks that make me think those are cut threads, so NPTF. Is that right?